<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			/*
			不会出现锚点定位的问题
			但不支持百分比，所以至少一栏是定宽的布局
			*/
			.a{
				width: 500px;
				border-left: 200px solid #999;
				background-color: #666;
			}
			.a:after{
				content: '';
				display: block;
				clear: both;
			}
			h3{ 
				float: left;
				margin-left: -200px;
				width: 200px;
				text-align: center;
				color: #fff;
			}
		</style>
	</head>
	<body>
		<div class="a">
			<h3>我是左边</h3>
			<div class="b">我是右边</div>
		</div>
	</body>
</html>
